C / C++ / MFC

David Crow11-May-04 5:39

David Crow

11-May-04 5:39

How about GetCurrentProcessId()?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Jens Doose11-May-04 5:42

11-May-04 5:42

That depends on the kind of data you already have.
Is it the current process? Or do you have the name of the executable? Or a window handle?

Jens

Opwar11-May-04 5:48

Opwar

11-May-04 5:48

Yeah the name is armyops.exe

Jens Doose11-May-04 5:55

11-May-04 5:55

Depending on your operating system you can use
- the PSAPI functions (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/process_status_helper.asp)
- or the ToolHelp functions (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/tool_help_library.asp)

Jens

Manually turn display into standby mode

Diddy11-May-04 6:07

Diddy

11-May-04 6:07

If you have the name of the process, and that process is not you, you must either search for a window you know that process created, and get the process ID from that, or, if you only have the name of the process, you need to use the PSAPI/ToolHelper API to enumerate all running processes, look at each one's name, check if it matched, and if so, grab it's process ID.

See here
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/perfmon/base/about_psapi.asp

Bare in mind PSAPI only works with NT/2k/XP so if you want a cross platform soulition, use ToolTip - see the file Tlhelp32.h in the platform SDK for a statring point- but you want something like this which terminates a process given a name

<br />
BOOL CTestEnvKillerApp::InitInstance()<br />
{<br />
<br />
// check which o/s<br />
OSVERSIONINFO osvi;<br />
memset(&osvi, NULL, sizeof(OSVERSIONINFO));<br />
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);<br />
GetVersionEx(&osvi);<br />
<br />
if (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT) // NT<br />
{<br />
	// load the process status helper library<br />
	HMODULE hLib = LoadLibrary( _T("psapi.dll") );<br />
	if (NULL == hLib)<br />
	{<br />
		AfxMessageBox(_T("Could not load PSAPI.DLL.\nPlease check it's in your path"), MB_OK | MB_ICONEXCLAMATION);<br />
		return FALSE;<br />
	}<br />
	// get the functions<br />
	lpfnEnumProcesses pFnEnumProc = (lpfnEnumProcesses)GetProcAddress( hLib, "EnumProcesses" );<br />
	lpfnGetModuleBaseName pFnGetModBaseName = (lpfnGetModuleBaseName)GetProcAddress( hLib, "GetModuleBaseNameA" );<br />
	lpfnEnumProcessModules pFnEnumProcMod = (lpfnEnumProcessModules)GetProcAddress( hLib, "EnumProcessModules" );<br />
		<br />
	if ( (NULL == pFnEnumProc) || (NULL == pFnGetModBaseName) || (NULL == pFnEnumProcMod) )<br />
	{<br />
		AfxMessageBox(_T("Could not find procedure in PSAPI.DLL"), MB_OK | MB_ICONEXCLAMATION);<br />
		FreeLibrary(hLib);<br />
		return FALSE;<br />
	}<br />
<br />
	DWORD dwNeeded = 0;<br />
	DWORD dwProcessIDs[1024];<br />
	memset(dwProcessIDs, NULL, sizeof(DWORD)*1024);<br />
<br />
	// get all the process IDs<br />
	if ( pFnEnumProc(dwProcessIDs, 1024, &dwNeeded) )<br />
	{<br />
		char szProcessName[MAX_PATH];<br />
<br />
		short sNumProcs = (short)( dwNeeded/sizeof(DWORD) );<br />
		for (short s = 0; s < sNumProcs; s++)<br />
		{<br />
			memset(szProcessName, NULL, sizeof(char)*MAX_PATH);<br />
			<br />
			// get the handle<br />
			HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE,<br />
											  FALSE, dwProcessIDs[s] );<br />
			if (hProcess)    <br />
			{        <br />
				HMODULE hMod = NULL;<br />
				dwNeeded = 0;<br />
<br />
				// retrieve handle<br />
				if ( pFnEnumProcMod( hProcess, &hMod, sizeof(hMod), &dwNeeded) )        <br />
				{<br />
					// get the name<br />
					if (!pFnGetModBaseName( hProcess, hMod, szProcessName, sizeof(szProcessName) ) )<br />
					{<br />
						CloseHandle(hProcess);<br />
						continue;<br />
					}<br />
						<br />
					// check if it's an EPOC Connect process<br />
					if ( ItsOurProcess() )<br />
					{<br />
						// terminate it<br />
						TerminateProcess(hProcess, 0);<br />
					}<br />
				}<br />
					<br />
				// done with this handle<br />
				CloseHandle(hProcess);<br />
			}<br />
		}<br />
	}<br />
<br />
	// done with library<br />
	FreeLibrary(hLib);<br />
	}<br />
	else if (osvi.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) // 95/98<br />
	{<br />
		HMODULE hLib = LoadLibrary( _T("kernel32.dll") );<br />
		if (NULL == hLib)<br />
		{<br />
		AfxMessageBox(_T("Could not load kernel32.DLL.\nPlease check it's in your path"), MB_OK | MB_ICONEXCLAMATION);<br />
		return FALSE;<br />
		}<br />
<br />
		// get the functions<br />
		lpfnProcess32First pFnProc32First = (lpfnProcess32First)GetProcAddress( hLib, "Process32First" );<br />
		lpfnProcess32Next pFnProc32Next = (lpfnProcess32Next)GetProcAddress( hLib, "Process32Next" );<br />
		lpfnTH32Snap pFnTH32Snap = (lpfnTH32Snap)GetProcAddress( hLib, "CreateToolhelp32Snapshot" );<br />
<br />
		if ( (NULL == pFnProc32First) || (NULL == pFnProc32Next) || (NULL == pFnTH32Snap) )<br />
		{<br />
			AfxMessageBox(_T("Could not find procedure in Kernel32.DLL"), MB_OK | MB_ICONEXCLAMATION);<br />
			FreeLibrary(hLib);<br />
			return FALSE;<br />
		}<br />
		<br />
		PROCESSENTRY32 pe;<br />
		memset(&pe, NULL, sizeof(PROCESSENTRY32));<br />
		<br />
		// get a handle to the current system snapshot of processes<br />
		HANDLE hSnapshot = pFnTH32Snap(TH32CS_SNAPPROCESS, 0);<br />
<br />
		if (!hSnapshot)<br />
		{<br />
			AfxMessageBox(_T("Could not retrieve process snapshot"), MB_OK | MB_ICONEXCLAMATION);<br />
		}<br />
<br />
		// get a list of the processes<br />
		pe.dwSize = sizeof(PROCESSENTRY32);<br />
		<br />
		if ( pFnProc32First(hSnapshot, &pe) )<br />
		{<br />
	        MODULEENTRY32 me32 = {0};          <br />
	        BOOL bGotModule = FALSE; <br />
			do<br />
			{<br />
				if ( GetProcessModule(pe.th32ProcessID, pe.th32ModuleID, &me32, sizeof(MODULEENTRY32), hLib) )<br />
				{<br />
					char szProcessName[MAX_PATH];<br />
					memset(szProcessName, NULL, sizeof(char)*MAX_PATH);<br />
<br />
					char drive[8];<br />
					char dir[MAX_PATH];   <br />
					char ext[8];<br />
					_splitpath(me32.szExePath, drive, dir, szProcessName, ext);<br />
					strcat(szProcessName, ext);<br />
<br />
					if ( ItsOurProcess())<br />
					{<br />
						// get the handle<br />
						HANDLE hProcess = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ | PROCESS_TERMINATE,<br />
													  FALSE, pe.th32ProcessID);<br />
						if (hProcess)<br />
						{<br />
							<br />
							// terminate it<br />
							TerminateProcess(hProcess, 0);<br />
							<br />
							// done with handle<br />
							CloseHandle(hProcess);<br />
						}<br />
					}<br />
				}<br />
			}<br />
			while(pFnProc32Next(hSnapshot, &pe));<br />
		}<br />
		<br />
		// done with handle<br />
		CloseHandle(hSnapshot);<br />
<br />
		// done with library<br />
		FreeLibrary(hLib);<br />
	}<br />
	else<br />
	{<br />
		AfxMessageBox(_T("Operating system does not support this application"), MB_OK | MB_ICONEXCLAMATION);<br />
	}<br />
	return FALSE;<br />
}

FYI ToolHelp works on both sets of platform so you could just use that

mleonhartsberger11-May-04 4:55

mleonhartsberger

11-May-04 4:55

Hi!

I'm searching for code or just the name of the windows api function that can turn _only_ the screen (not the whole computer) into standby mode, in other words, turn it off, until the mouse gets moved or a key gets pressed.

I found out that there's a (user configurable) display idle timer, however, I haven't found a way to manipulate this timer programmatically.

There are actually quite a lot of functions in the windows api related to power managment, but seemingly not one to turn only the screen off...

Maybe someone can help me,

Martin Leonhartsberger
mleonhartsberger@a1.net

Re: Manually turn display into standby mode

David Crow11-May-04 5:48

David Crow

11-May-04 5:48

Create a power scheme where USER_POWER_POLICY.VideoTimeoutAc is set to 1 (second). Save the policy by calling WritePwrScheme(). Then call SetActivePwrScheme() to set the current power scheme to the one that you just created. This is just a high-level overview, but hopefully you get the gist enough to fill in the blanks.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Re: Manually turn display into standby mode

mleonhartsberger11-May-04 9:26

mleonhartsberger

11-May-04 9:26

Yeah thanks I successfully used your description to send my screen into darkness after one second.

But (there's always one Poke tongue | ;-P

) theres the problem of waking up again. If I don't move the mouse around continously the screen blankens immediately again (no surprise, timer is still set to 1 second).
So I thought, well, why don't wait the second until standby mode kicks in, and then write the old timer back? I use Sleep() for this, but the problem is, after Sleep() returns, the system thinks that it should awaken itself again and the screen turns on.

So, I need a way to wait this second and write the old scheme back WITHOUT letting the system think it should wakeup.

Re: Manually turn display into standby mode

David Crow11-May-04 9:33

David Crow

11-May-04 9:33

You might need to use GetLastInputInfo() to know when the mouse/keyboard was last used.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Chart Control !!

Rafael Fernández López11-May-04 4:47

Rafael Fernández López

11-May-04 4:47

I'd like to introduce into my app a control like Dundas Chart (it's so pretty..., but so expensive too..., no cracks wanted and no burning either) but I don't want to use Microsoft's Chart Control...

OH !!, I'm a MFC programmer.

Please, if you know about a class like Dundas Chart make me know it...

Thankx !! Smile | :)

Written by: Rafael Fernández López.

Visit: http://www.maestroprogramador.com

Re: Chart Control !!

Ravi Bhavnani11-May-04 6:49

Ravi Bhavnani

11-May-04 6:49

Clickety[^]

/ravi

My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com

Does anything affect Sleep ()

cheesepirate11-May-04 4:40

cheesepirate

11-May-04 4:40

If a computer is suspended/hibernating, does that affect then length of time a process will sleep for?

If a process is told to Sleep () for 1 hour and after half an hour the computer is put into hibernate for 2 hours, when it starts back up again and Windows resumes, does the process still have half an hour to Sleep (), or is its Sleep () time up (having effectively slept for 2 1/2 hours already)?

toxcct11-May-04 4:47

toxcct

11-May-04 4:47

i don't know for your effective question, but don't use sleep() function for so long waits...
i uses active waits, and so need full CPU time.

TOXCCT >>> GEII power

cheesepirate11-May-04 4:54

cheesepirate

11-May-04 4:54

Yeah, it's not good - I got a program dropped on my desk and while I'm fixing it by re-writing it, I still have to try and make the old version work Frown | :(

Jens Doose11-May-04 4:57

11-May-04 4:57

I am not quite sure if Sleep really waits actively...

See MSDN:
<quote>The Sleep function suspends the execution of the current thread for at least the specified interval.

Jens

toxcct11-May-04 4:59

toxcct

11-May-04 4:59

yes, what does it say with that ??! give us the entire paragraph please...
Big Grin | :-D

i already read the MSDN ; it is not advised

TOXCCT >>> GEII power

Jens Doose11-May-04 5:09

11-May-04 5:09

My comment didn't answer your original question.
I just wanted to state that I don't think that
calling "Sleep" will cause the thread to wait actively.

It would be rather dumb to implement a task scheduler which lets a thread that called Sleep wait actively, wouldn't it?

To clarify:
By "waiting actively" I mean a continous loop until a condition is reached, like this one:

<br />
while ( true )<br />
{<br />
  if ( bConditionIsReached )<br />
  {<br />
    break;<br />
  }<br />
}<br />

Jens